This land he's building it on is cheap and I look forward to my county using it to advantage everyone. Why do you think you get a say on what happens in my home?

Because in Ontario, where his mansion is located, the government hasn't been approving such projects and is facing pressure not to. (https://globalnews.ca/news/12134754/ford-government-to-appro...) Even if the province approved, the lake community surrounding his mansion might not want one, for all the same reasons that the US voters in the source article don't want one.

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It's the same reason politicians won't house illegal immigrants in their home.